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BS EN ISO 294-2:2018 pdf free

BS EN ISO 294-2:2018 pdf free.Plastics一Injection moulding of test specimens of thermoplastic materials
This document specifies a four-cavity mould, the type C ISO mould, for the injection moulding of small tensile bars measuring≥60 mm x 10 mm x 3 mm (the type CW11 test specimen in ISO 20753).
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 294-1:2017, Plastics 一Injection moulding of test specimens of thermoplastic materials一Part 1: General principles, and moulding of multipurpose and bar test specimens
ISO 20753, Plastics 一Test specimen
For the purposes of this document, the terms and definitions given in ISO 294-1 apply.
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The type C ISO mould is a four-cavity mould with a double-T runner (see Figure 1) intended for the preparation of small tensile bars to be used for the measurement of so-called “indicative” properties when studying the effects of environmental influences, such as liquid chemicals, heat or weathering, on plastics (see ISO 1 1403-3). The bar mouldings produced using this mould shall have the dimensions of the type CW11 specimen defined in ISO 20753 plus a thickness of 3,0 mm±0,2 mm.
For the type C ISO mould, it is recommended that the injection velocity, VI, be chosen such that the injection time, tl, is comparable to that used for the type A ISO mould.
NOTE 1 The cavities in the type C ISO mould have a low critical cross-sectional area Ac of only 9 mm2, i.e.much lower than that for the type A ISO mould (40 mm2). If the same injection speed VI were used for the type C
NOTE 2 This document does not address the question of changes in screw advance speed, e.g. high speeds when filling the runners and low speeds when filling the cavities. As a result of the inertia of the injection-moulding machine, peaks in melt pressure and/or injection speed often cannot be avoided if the screw advance speed is changed during injection.BS EN ISO 294-2 pdf download.


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